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AssigneeNextrusion GMBH
InventorsHans-Joachim Bruning, Andreas Fischer, Jan Adolph Dam Backer, Mark James Bonner, Ian McMillan Ward
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The invention relates to a method for the production of high-strength ribbons having a high modulus of elasticity made of a highly molecular polyolefin, wherein the polyolefins, particularly polypropylene and polyethylene, are extruded through a slotted nozzle, are then subjected to a temperature of 85° to 135° C. for a duration of at least one second, the films are then cut into individual ribbons, if necessary, and stretched at temperatures between 90° and 165° C. in one or more steps, are rolled up or further processed directly into textiles or technical flexible sheet materials. The ribbons can be laminated into multi-layer flexible sheet materials by using adhesives or adhesion promoters, the flexible sheet materials being particularly suitable as protection from ballistic projectiles. In this case particularly in the form of plate-shaped or flexible compound bodies.
Method of producing high-strength ribbons having a high modulus of elasticity from polyolefin of high molecular weight, characterised in that the polyolefin is extruded through a slit die as a melt whose temperature is at least 10° C. above the melting point of the polyolefin, the emerging film, which is still in the melted state, is then exposed to a temperature from 85° to 135° C. for a period of at least one second, the film is then cut into individual ribbons if required and is then stretched in one or more stages at temperatures of between 90° C. and 165° C. until a total stretch of 15:1 to 60:1 is reached, and the ribbons are wound into reels or further processed directly into textile or engineering sheet materials.
Dependencies are inferred from the claim text.